/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package studio.raptor.sqlparser.ast.expr;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import studio.raptor.sqlparser.ast.SQLExpr;
import studio.raptor.sqlparser.ast.SQLExprImpl;
import studio.raptor.sqlparser.ast.SQLObjectImpl;
import studio.raptor.sqlparser.visitor.SQLASTVisitor;

public class SQLCaseExpr extends SQLExprImpl implements Serializable {

  private static final long serialVersionUID = 1L;
  private final List<Item> items = new ArrayList<Item>();
  private SQLExpr valueExpr;
  private SQLExpr elseExpr;

  public SQLCaseExpr() {

  }

  public SQLExpr getValueExpr() {
    return this.valueExpr;
  }

  public void setValueExpr(SQLExpr valueExpr) {
    if (valueExpr != null) {
      valueExpr.setParent(this);
    }
    this.valueExpr = valueExpr;
  }

  public SQLExpr getElseExpr() {
    return this.elseExpr;
  }

  public void setElseExpr(SQLExpr elseExpr) {
    if (elseExpr != null) {
      elseExpr.setParent(this);
    }
    this.elseExpr = elseExpr;
  }

  public List<Item> getItems() {
    return this.items;
  }

  public void addItem(Item item) {
    if (item != null) {
      item.setParent(this);
      this.items.add(item);
    }
  }

  protected void accept0(SQLASTVisitor visitor) {
    if (visitor.visit(this)) {
      acceptChild(visitor, this.valueExpr);
      acceptChild(visitor, this.items);
      acceptChild(visitor, this.elseExpr);
    }
    visitor.endVisit(this);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((elseExpr == null) ? 0 : elseExpr.hashCode());
    result = prime * result + ((items == null) ? 0 : items.hashCode());
    result = prime * result + ((valueExpr == null) ? 0 : valueExpr.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    SQLCaseExpr other = (SQLCaseExpr) obj;
    if (elseExpr == null) {
      if (other.elseExpr != null) {
        return false;
      }
    } else if (!elseExpr.equals(other.elseExpr)) {
      return false;
    }
    if (items == null) {
      if (other.items != null) {
        return false;
      }
    } else if (!items.equals(other.items)) {
      return false;
    }
    if (valueExpr == null) {
      if (other.valueExpr != null) {
        return false;
      }
    } else if (!valueExpr.equals(other.valueExpr)) {
      return false;
    }
    return true;
  }

  public static class Item extends SQLObjectImpl implements Serializable {

    private static final long serialVersionUID = 1L;
    private SQLExpr conditionExpr;
    private SQLExpr valueExpr;

    public Item() {

    }

    public Item(SQLExpr conditionExpr, SQLExpr valueExpr) {

      setConditionExpr(conditionExpr);
      setValueExpr(valueExpr);
    }

    public SQLExpr getConditionExpr() {
      return this.conditionExpr;
    }

    public void setConditionExpr(SQLExpr conditionExpr) {
      if (conditionExpr != null) {
        conditionExpr.setParent(this);
      }
      this.conditionExpr = conditionExpr;
    }

    public SQLExpr getValueExpr() {
      return this.valueExpr;
    }

    public void setValueExpr(SQLExpr valueExpr) {
      if (valueExpr != null) {
        valueExpr.setParent(this);
      }
      this.valueExpr = valueExpr;
    }

    protected void accept0(SQLASTVisitor visitor) {
      if (visitor.visit(this)) {
        acceptChild(visitor, this.conditionExpr);
        acceptChild(visitor, this.valueExpr);
      }
      visitor.endVisit(this);
    }

    @Override
    public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + ((conditionExpr == null) ? 0 : conditionExpr.hashCode());
      result = prime * result + ((valueExpr == null) ? 0 : valueExpr.hashCode());
      return result;
    }

    @Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (obj == null) {
        return false;
      }
      if (getClass() != obj.getClass()) {
        return false;
      }
      Item other = (Item) obj;
      if (conditionExpr == null) {
        if (other.conditionExpr != null) {
          return false;
        }
      } else if (!conditionExpr.equals(other.conditionExpr)) {
        return false;
      }
      if (valueExpr == null) {
        if (other.valueExpr != null) {
          return false;
        }
      } else if (!valueExpr.equals(other.valueExpr)) {
        return false;
      }
      return true;
    }

  }

}
